Hubble observations of massive stars in the Large Magellanic Cloud

This is the Hubble Space Telescope Cosmic Origins Spectrograph (COS) observation of 30 Dor #016 compared with one by the Hubble Space Telescope Imaging Spectrograph (STIS) of the similar star HDE 269810, also in the Large Magellanic Cloud.

The stellar-wind features of helium, carbon, oxygen, and nitrogen are identified by their chemical symbols above; the roman numerals indicate the ionisation stages, i.e., the number of electrons removed plus one. (“I” would indicate the neutral atom.) The broad emission components plus blue-shifted absorption are diagnostics of the stellar winds; the absorption forms along the line of sight to the stellar disk, where the wind is approaching us at its full speed. 

The O V line is a unique feature of the hottest (O2-O3) stars.


NASA, ESA, C. Evans (Royal Observatory Edinburgh), N.Walborn (STScI) and D. Lennon (ESA/STScI)

About the Image

Release date:11 May 2010, 15:00
Related releases:heic1008
Size:2091 x 1122 px

About the Object

Name:30 Dor, Large Magellanic Cloud, STIS
Type:• Local Universe : Star
• Local Universe : Galaxy : Type : Irregular
Distance:170000 light years

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